A frittata is a thick Italian omelet full of vegetables, herbs and cheese. Unlike many other egg dishes, frittatas can be made ahead and reheated or served cold or at room temperature. This dish reheats well in the microwave and can keep refrigerated in a tightly sealed container for up to one week. For a lower-fat version, cut back on the amount of cheese you use. Adapted from Mollie Katzen’s Sunlight Café.